How to use Vim for string Search & Replace?

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Assuming here is a file "Peter.txt". How could we do search & replace using Vim?

1. INPUT    vim Peter.txt
2. PRESS    Ctrl+C key
3. INPUT    :1,$s/blue/purple/g
4. PRESS    Enter key

Now, we could successfully replace all the strings "blue" to "purple" in file "Peter.txt"

Note: "1,$" means from the first line to the end of file.

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